package com.yidu.manage.controller.base;

import com.google.code.kaptcha.Producer;
import com.yidu.common.define.Constants;
import com.yidu.common.utils.Base64Util;
import com.yidu.common.utils.ResultUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

@RestController
public class CaptchaController
{
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisTemplate<String,String> redisTemplate;

    // 验证码类型
    @Value("${system.captchaType:math}")
    private String captchaType;

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public Object getCode() throws IOException
    {
        // 保存验证码信息
        String uuid = UUID.randomUUID().toString();
        String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;

        String capStr, code = null;
        BufferedImage image = null;

        // 生成验证码
        if ("math".equals(captchaType))
        {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else if ("char".equals(captchaType))
        {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }
        redisTemplate.opsForValue().set(verifyKey,code,Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try
        {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e)
        {
            return ResultUtil.error(e.getMessage());
        }
        return ResultUtil.success(Map.of("uuid", uuid, "img", Base64Util.encode(os.toByteArray())));
    }
}
